12721210 has 16 divisors (see below), whose sum is σ = 22976136. Its totient is φ = 5071168.

The previous prime is 12721207. The next prime is 12721211. The reversal of 12721210 is 1212721.

It can be written as a sum of positive squares in 4 ways, for example, as 9235521 + 3485689 = 3039^2 + 1867^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12721211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1164 + ... + 5176.

Almost surely, 2^12721210 is an apocalyptic number.

12721210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12721210 is a deficient number, since it is larger than the sum of its proper divisors (10254926).

12721210 is a wasteful number, since it uses less digits than its factorization.

12721210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 12721210 is about 3566.6805295681. The cubic root of 12721210 is about 233.4404655432.

Adding to 12721210 its reverse (1212721), we get a palindrome (13933931).

The spelling of 12721210 in words is "twelve million, seven hundred twenty-one thousand, two hundred ten".